iOS
The Walking Dead
Bastion
Jurassic Park Builder
Angry Birds Space
Amazing Alex
Recurse
Bad Piggies
Scribblenauts
Angry Birds Star Wars
PunchQuest
Curiosity
PC
Don't Starve
Slender
The Witcher 2: Assassin's of Kings Enhanced Edition
Sins of a Solar Empire: Rebellion
A Valley Without Wind
Borderlands 2
Torchlight 2
Mark of the Ninja
Far Cry 3
Dear Esther
360
Darksiders 2
Dynasty Warriors 7
Alan Wake's American Nightmare
Mass Effect 3
Fez
Max Payne 3
Steel Battalion: Heavy Armor
Halo 4
Forza Horizon
Call of Duty: Black Ops 2
PS3
Papo y Yo
Resident Evil: Chronicles HD Collection
Amy
Shank 2
SSX
Journey
Assassin's Creed 3
Vita
Uncharted: Golden Abyss
Mortal Kombat
Final Fantasy Tactics
Sound Shapes
Rayman Origins
Sumioni
Tales From Space: Mutant Blobs Attack
PlayStation All Stars Battle Royale
Assassin's Creed 3: Liberation
Wii U
New Super Mario Bros. U
Zombi U
Nintendoland
* I also played some games on Android, Wii, and 3DS, but they came out in 2011, I think.
** No, I did not play Diablo III. Torchlight 2 sufficed.
*** I intend to play Dishonored before the year is out, but we'll see.